Malicious PDF — malware analysis report

Static analysis result for SHA-256 e71af4277a37c08f…

MALICIOUS

PDF

70.3 KB Created: 2021-09-24 18:47:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 7da026f0ba5c595f5e5916f8cb992acc SHA-1: 4c1eddaa93262fbe3f77b898ee87640eadb8b4bf SHA-256: e71af4277a37c08f4f45584f9e5bc98098ef6f131f20fa3438b0e328025f43ca
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs that point to various websites, many of which are identified as link farms on disposable hosting or compromised CMS uploads. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of multiple external URIs and link farm heuristics suggests the primary goal is to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://wastran.ru/uplcv?utm_term=android+bluetooth+pin+code PDF link annotation
    • http://hiredriver.com/uploads/assets/files/laxet.pdfIn PDF document text
    • http://freemansphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b1cb0147e1---kimilimitag.pdfIn PDF document text
    • https://laps.pl/userfiles/file/karulobegik.pdfIn PDF document text
    • http://carnavaldemarbella.com/Senegal_5/Content/files/userfiles/file/jenotipajufin.pdfIn PDF document text
    • http://jarauwerdaenzn.nl/userfiles/file/nobefagana.pdfIn PDF document text
    • https://tocgia247.com/wp-content/plugins/super-forms/uploads/php/files/o9o9jd9dma70sl71je38i0fjnv/zezamavudigefodabuki.pdfIn PDF document text
    • http://aotwresort.org/ckfinder/userfiles/files/barirogesedivaralivivud.pdfIn PDF document text
    • https://korvioinfotech.com/ckfinder/userfiles/files/67298603419.pdfIn PDF document text
    • https://franciscovalles.comtraining.cl/userfiles/files/51812638945.pdfIn PDF document text
    • https://drivetripper.com/userfiles2020/files/60124264120.pdfIn PDF document text
    • https://landlorddebtadvisory.com/wp-content/plugins/super-forms/uploads/php/files/37bc1fe524224ff1bab8638988209fc7/90176825496.pdfIn PDF document text
    • http://uhorder.com/upload/files/zudigivoromukupalozoxama.pdfIn PDF document text
    • https://plentis.eu/ckfinder/userfiles/files/14507044584.pdfIn PDF document text
    • http://www.movingintofreedom.com/wp-content/plugins/formcraft/file-upload/server/content/files/161354b3cde274---xujofalewafibotupejefez.pdfIn PDF document text
    • https://www.wsbe17hongkong.hk/_bin/ckfinder/userfiles/files/baleboxivuwebunatuzelame.pdfIn PDF document text
    • https://agriplan-rs.com/dados/ckfinder/files/76903737960.pdfIn PDF document text
    • http://food-cloud.com/home/food-cloud/www/site/site/data/files/39270015399.pdfIn PDF document text
    • http://kidneytracker.com/ckfinder/userfiles/files/pifakegu.pdfIn PDF document text
    • https://ispartaorganizasyon.com/ckfinder/upload/files/69821370388.pdfIn PDF document text
    • http://skiflogistics.ru/userfiles/file/34383615667.pdfIn PDF document text
    • https://brusroom.com/wp-content/plugins/super-forms/uploads/php/files/f92405783e4ecc298414b3ccc67dc006/sasuwoluxesaraxi.pdfIn PDF document text
    • https://nhatngudongkinh.phapluatvietnam.com/upload/ckupload/files/25357658161.pdfIn PDF document text
    • http://xn----7sbab1bcaqplb0ccyi9d.xn--p1ai/files/file/rolumelikijex.pdfIn PDF document text
    • http://tajesink.com/Uploadfiles/files/binabivoda.pdfIn PDF document text
    • http://acm-medicali.it/userfiles/files/jivevozemarinenewigu.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b4ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB4CA 10504 bytes
SHA-256: f013ff47ae192cf61f8e341b7f7670bd7ce5ef34532d784a0f3aae2a0705b9cf
font_01_sfnt_off0000cc52.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC52 15488 bytes
SHA-256: eaaf6bd62c39bd4461f82f8059567cfcc4bf6098f74e3c137f9ef74fe4e8e4a3
font_02_sfnt_off0000f38a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF38A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1